Opponents have said they were not conceding the race and and could request a recount. There is no automatic recount for ballot issues in Maine.

Question 1 on Maine's ballot read “Do you want to allow the possession and use of marijuana under state law by persons who are at least 21 years of age, and allow the cultivation, manufacture, distribution, testing, and sale of marijuana and marijuana products subject to state regulation, taxation and local ordinance?”

Supporters of the initiative, including the American Civil Liberties Union of Maine, said generate revenue for the state and allow police to focus on more serious crimes. The initiative calls for a 10-percent sales tax on the drug.

Opponents, including many law enforcement officials, said it would increase access to the drug among young people and pose regulatory problems for the state.

Recreational use of marijuana is currently legal in Colorado, Oregon, Washington, Alaska and the District of Columbia. Voters in Maine and four other states -- California, Massachusetts, Arizona and Nevada -- were set to decide the issue on Tuesday.

Medical use of marijuana is allowed in Maine and 19 other states. Maine approved medical marijuana in 1999.